Rectifier



6, 1948. w, R, KQCH 2,439,224

RECTIFIER Filed Nov. 6. 1945 IN VEN TOR.

In}'Vlfela Koch weggaan,

Armes/5y Patented Apr. 6, 1948 RECTIFIER Winfield E. Koch, Haddoniieid,N. J., assigner to Radio Corporation of America, a corporation ofDelaware Application November 6, 1945, Serial No. 627,056

(Cl. Mil- 97) 3 Claims.

second anode of the image-reproducing cathode i ray tube or lrinescope,the amplitude of this substantially smooth D.-C. potential beingapproximately two or more times the pealr amplitude ci the voltagepulses.

As pointed out in the mentioned Schade application, conventional voltagestep-up, or multiplying, arrangements are not practical for the purposeof obtaining cathode ray tube accelerating potentials (which may be inthe neighborhood oi 30,000 volts, for example) from a scanning circuitdue to the highly unsymmetrical character of the voltage wave.Consequently, the Schade disclosure comprises a series of rectiiierunits, each of these units including a condenser or other energy storingdevice across which there is developed a relatively smooth D.C.potential having` a value approximately equal to the pealr` value of theinput pulses. These energy storage devices are then connected in aparticular series relation, so that the output voltage of the rectiersystem is approximately the sum of the voltages developed on the energystorage devices or the individual units.

The performance of a rectifier system such as disclosed in the copendingSchade application referred to above is satisfactory as long as the loadon the rectiiier remains relatively constant. Due to the seriesconnection of the energy storage devices, however, any appreciableincrease in load may cause a noticeable drop in the amplitude of theoutput voltage. In other Words, for a varying load, it is diil'icult toobtain a high standard of regulation with a rectilier of this typ-e.

It is an object of the present invention, therelore, to provide ahigh-voltage surge type rectier circuit in which the output voltage dropin the face oi load uctuations is at a minimum.

It is a further object of the invention to provide a high-voltage surgetype rectiiier circuit in which storage condensers having relatively lowrated capacity values may be used for a given regulation or outputvoltage.

Other objects and advantages will be apparent from the followingdescription of preferred forms 2 of the invention and from the drawings,in which:

Fig. l is a circuit diagram of a pulse type rectiiier in accordance withthe present invention, arranged to provide a voltage output ofapproximately twice the voltage input;

Fig. 2 is a circuit diagram of a pulse type rectiiler in accordance withthe present invention, arranged to provide a voltage outputapproximately three times the voltage input; and

Fig. 3 is a circuit diagram of a modication of the circuit of Fig. l soas to secu-re a multiplied output voltage of negative polarity from aninput or pulses of positive polarity. These voltages are given withrespect to ground, or to the terminals or the input and output which aredirectly connected together.

Referring first to Fig. l, there is shown a preferred iorm of voltagedoubling circuit operating in accordance with the present invention. Aseries of input voltage pulses P of positive polarity are applied acrossthe series combination oi a rectiiier tube Vi (which may a diode asshown, or any other suitable unidirectional conducting device) and acondenser (or other suitable energy-storage element) C1.l Due to therectifying action of tube V1, condenser C1 will he charged to the peakvoltage E of the input pulses P, the upper plate (in the drawing) ofcondenser Ci being of positive polarity.

During the` time intervals between the pulses P, a portion of thepositive charge on condenser Ci will leak ou through resistor R1 to asecond condenser, or energy-storage element, C2, the latter having oneof its plates connected tc the anode of tube V1. Consequently, afterseveral cycles of the input Wave, the charge on condenser Cz will alsohe equal to the pealr voltage E of the pulses P, the polarity of thecharge on condenser Cz being as shown in the drawing.

Condenser C2 is connected across the input terminals of the system inseries with a further rectier tube V2 (shown as a diode) and a furtherenergy-storage element C3 (shown as a condenser). Accordingly, duringthe pulse periods, tube V2 has applied to it not only the peak pulsevoltage E, but also the D.C. charge E on condenser C2. The polarity or'these potentials is such that the condenser C: will be charged to a peakvalue 2E, representing the algebraic sum oi' the peak pulse E and theD.-C. voltage E on condenser Cs. The output voltage 2E of the system isderived from across condenser C3.

As previously stated, the rectifying system of the present invention isparticularly suited for use in circuit applications Where the loaductuates in value. The output of the disclosed system, in the face ofsuch fluctuations, is much more stable than in the case of rectiiyingarrangementsl where the energy-storage elements

